Influence of the combined-effect of NaCl and Na2SO4 on the hot corrosion behaviour of aluminide coating on Ni-based alloys

Yu, Xia; Song, Peng; He, Xuan; Khan, Asghar; Huang, Taihong; Li, Chao; Li, Qiaolei; Lü, Kaiyue; Chen, Kunlun; Lu, Jiansheng

doi:10.1016/j.jallcom.2019.03.165

Cited by 39 publications

(5 citation statements)

References 39 publications

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“…K438 Ni-based superalloy has good high temperature oxidation and corrosion resistance (Yu et al, 2019). The chemical constituents are listed in Table 1.…”

Section: Experimental Specimen Preparationmentioning

confidence: 99%

“…The common methods for preparing aluminide coating are thermal spray, pack cementation, chemical vapor deposition, and hot-dipping (Hu et al, 2006;Zhang et al, 2012;Cheng et al, 2013;Shirvani et al, 2013;Xu et al, 2015;Sitek et al, 2016). Comparatively, the pack cementation process is simple and the cost is low, so it is suitable for specimens with higher requirements for bonding strength of the coating (Yuwen and Zhou, 2016;Yu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

Zhang

Song

et al. 2021

Front. Mater.

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Aluminide coating is prepared on K438 Ni-based superalloy by pack cementation. The hot corrosion test of as-received and pre-oxidation aluminide coating in Na2SO4 salt are carried out at 1050°C. The coating morphologies, phase composition, and corrosion products are characterized by XRD, SEM, EDS, and TEM. The conclusion is that the pre-oxidation aluminide coating has excellent hot corrosion properties. After hot corrosion, the oxide scale of pre-oxidation aluminide coating is the thinnest and maintains good integrity. However, the oxide scale of as-received aluminide coating fluctuates greatly and there are corrosion cavities. CrS is formed in the alloy immediately below the oxide scale for the two coating systems.

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“…K438 Ni-based superalloy has good high temperature oxidation and corrosion resistance (Yu et al, 2019). The chemical constituents are listed in Table 1.…”

Section: Experimental Specimen Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

Zhang

Song

et al. 2021

Front. Mater.

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“…This combination of strengthening mechanisms gives K438 high-temperature alloys their exceptional properties. These alloys are especially favored for aero-engine blades and gas turbines due to their exceptional thermal stability and resistance to thermal corrosion [17][18][19]. Even at elevated temperatures ranging from 540 • C to 1000 • C, nickel-based superalloys maintain excellent mechanical and physical properties.…”

Section: Introductionmentioning

confidence: 99%

Influence of Scanning Strategy and Post-Treatment on Cracks and Mechanical Properties of Selective-Laser-Melted K438 Superalloy

Zhang,

Yan,

Xia

et al. 2024

Coatings

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The feasibility of manufacturing high-performance components with complex structures is limited due to cracks in some superalloys fabricated by selective laser melting (SLM). By controlling the main process parameters such as scanning strategy, the adverse effects of cracks can be effectively reduced. In this paper, the effects of two different SLM scanning strategies with island and ‘back-and-forth’ and post-heat treatment on the cracks and mechanical properties of selective-laser-melted (SLMed) K438 alloy were investigated. The results show that the SLM method of the ‘back-and-forth’ scanning strategy had better lap and interlayer rotation angles and a more uniform distribution of laser energy compared with the island scanning strategy. The residual stress accumulation was reduced and crack formation was inhibited under this scanning strategy owing to the cooling and shrinkage process. In addition, the dislocation motion was hindered by the formation of uniformly dispersed MC carbides and γ’ phases during the SLM K438 alloy process, which resulted in the density of the as-built SLMed K438 alloy being up to 99.34%, the hardness up to 9.6 Gpa, and the tensile strength up to 1309 MPa. After post-heat treatment, the fine secondary γ’ phases were precipitated and dispersed uniformly in the Ni matrix, which effectively improved the Young’s modulus and tensile strength of the alloy by dispersing the stress-concentrated area.

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“…These experiments can be broadly categorized into two main types: corrosion research involving metal samples under chlorine-and alkali-consisting deposits [10][11][12][13][14][15][16][17][18][19][20][21][22], and research focusing on metal sample corrosion in a chlorine-rich atmosphere [23][24][25][26]. In the case of chlorine-and alkali-consisting deposit tests, researchers mainly used pure chlorine or potassium compounds like KCl, PbCl 2 , K 2 SO 4 , or their mixtures.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Protective Coatings on High-Temperature Corrosion under Biomass Ash Deposits

Maciejczyk,

Maj,

Ciukaj

et al. 2023

Energies

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The presented research determined the performance of the protective coatings against the corrosion process under biomass and refuse-derived fuel (RDF) ash deposits. High-temperature corrosion tests were performed on steel grades intended for use in the fabrication of pressure parts working in elevated temperatures such as superheaters in power boilers. Two steel grades were investigated, P235GH and 16Mo3, and two protective coatings were applied, Inconel 625 and Alloy 310. The samples were sourced from the industrial boiler manufacturing company. The samples were exposed to two ashes originating from biofuels and one ash originating from RDF for comparison, all collected from Polish heat plants and power plants. Exposures were carried out in an oxidizing atmosphere for a maximum time of 504 h. The test temperatures of 480, 520, and 580 °C simulated superheater conditions of biofuel- and waste-fired power boilers. The corrosion kinetics were determined by weight change measurements conducted after 24, 168, and 504 h of the exposure. Regardless of the exposure temperature and the type of ash under which the samples were investigated, the use of 2.0 mm thick protective coatings resulted in smaller increases in the weight of the tested coupons which proves that alloy coatings give measurable results and are good remedies for chlorine-induced corrosion.

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Influence of the combined-effect of NaCl and Na2SO4 on the hot corrosion behaviour of aluminide coating on Ni-based alloys

Cited by 39 publications

References 39 publications

Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

Influence of Scanning Strategy and Post-Treatment on Cracks and Mechanical Properties of Selective-Laser-Melted K438 Superalloy

The Influence of Protective Coatings on High-Temperature Corrosion under Biomass Ash Deposits

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